JavaScript is the industry standard client-side scripting language that is used in web applications.Professional JavaScript Frameworks: Prototype, YUI, Ext JS, Dojo and MooTools offers an examination of some of the top JavaScript (JS) frameworks that are available, with practical examples and explanations of what each does best.Over the past few years, theres been a small renaissance in JavaScript as a language. A variety of projects have sprung up to build reusable JS libraries and frameworks and at this point, a good number of them have matured and shown staying power that theyre worth taking a serious look at and relying on in professional projects.JavaScript has grown in popularity in parallel with the Web and today is supported by all major browsers and new web technologies. JavaScript has been extended over time to deliver high-performing and incredibly impressive Web user experiences, using technologies including Adobe Flash, AJAX, and Microsoft Silverlight.As JavaScript is used increasingly for serious development on the Web, the lessons that have been learned and the tools that have been invented along the way are being consolidated and shared by developers in the form of libraries and frameworks. However, since JavaScript is such a flexible and dynamic language, each framework can present very different approaches to the problems of web development each with its own pros and cons.Coverageof the individual libraries and frameworks includes:Prototype: Extending and Enhancing DOM ElementsPrototype: Handling Cross-Browser EventsPrototype: Simplifying AJAX and Dynamic DataPrototype: Working with FormsPrototype: Manipulating Common Data Structures and FunctionsPrototype: Extending PrototypeYahoo! User Interface Library (YUI): Traversing and Manipulating the DOM with YUIYUI: Handling Cross-Browser EventsYUI: Using Animation and Drag and DropYUI: Simplifying AJAX and Dynamic LoadingYUI: Building User Interfaces with WidgetsEnhancing Development with the YUI CoreYUI: Dealing with Data, Tables, and ChartsWorking with YUI CSS ToolsBuilding and Deploying YUIExtJS: Architecture and Library ConventionsExtJS: Elements, DomHelper, and TemplatesExtJS: Components, Layouts, and WindowsExtJS: Handling Data and Talking with the ServerExtJS: DataViews and GridsExtJS: Form Controls, ValidationDojo: Enhancing Development with Dojo CoreDojo: Manipulating the DOMDojo: Handling EventsDojo: Composing AnimationsDojo: Working with AJAX and Dynamic DataDojo: Building User Interfaces with WidgetsBuilding and Deploying DojoExpanding DojoEnhancing Development with MooToolsMooTools: Manipulating the DOM and Handling EventsMooTools: Simplifying AJAX and Handling Dynamic DataMooTools: Building User Interfaces and Using Animation